1.4 Network Security

Question 1

What is a Firewall?

Answer 1

Screens incoming and outgoing traffic

Can be software or hardware

Question 2

Describe Static Packet Filtering

Answer 2

Type of firewall implementation

Packets are analyzed against filters.

Limited up to Layer 3 in what information is filtered.

Question 3

Describe Proxy Service Firewalls

Answer 3

Acts as intermediary between LAN and WAN, making your network transparent.

Information from the Internet is retrieved by the firewall then sent to the requesting system.

Operates up to layer 7, application.

Question 4

Describe Stateful Packet Inspection (SPI)

Answer 4

Compares certain key parts of the packet to a database of trusted information.

Operates up to Layer 7,.

Question 5

What is a VPN

Answer 5

Virtual Private Network

Utilizes Tunneling Protocol to connect LAN to LAN over the WAN or socket to socket over any other network. Encrypts the data to be sent over the WAN and decrypts in at the other LAN.

Question 6

Describe intranet VPNs

Answer 6

Implement controlled access to individual subnets within a private neetwork. You are doing the same thing as LAN to LAN through WAN but it is subnet to subnet through LAN.

Question 7

Describe Tunneling

Answer 7

A logical network connection to communcate over the virtual network.

Encrypts at the sending side and decrypts at the recieving side.

Question 8

What are 3 VPN Tunneling Protocols?

Answer 8

PPTP (Point to Point Tunneling Protocol)
L2TP (Layer Two Tunneling Protocol)

Question 9

What is Cascade VPN Chaining?

Answer 9

Multiple VPNs in series between you and the address you are seeking.

Question 10

What is a Nested VPN Chain

Answer 10

VPNs within VPNs within networks etc.

Example is CSNI within DWAN. Or SHIPLAN within DWAN.